No output when --prod is applied?

I am upgrading a PWA app from ionic 4/Angular 8 to Ionic 5/Angular 9.
Since the upgrade I have problems when I do a “ionic build --prod” command, before it was working fine, also with “–prod”.

Following lines gives an output in “ionic build” mode correctly, but gives no output with “ionic build --prod” (there is no output read at all/stays empty but should log on input):

console.log('output barcode2 : ', this.rows.at(idx).value.barcode2)

I think it is ionic related and not angular, but I’m not sure. Anyway, I can not seem to find why the “–prod” flag produces this issue. Can someone inform me ?

Thanks

html:

<div [formGroup]="timeform" novalidate align="center">
<ion-grid>
  <ion-row *ngFor="let row of timeform.get('rows')?.controls; let idx = index;" class="ion-justify-content-center">
     <ion-col>
        <ion-row>
         <ion-col size="10">
           <ion-input pattern="[0-9]*" inputmode="decimal" [formControl]="row.get('barcode2')"
            formControlName="barcode2" placeholder="..." #Field2 (ionChange)="findActivity(idx)" 
            (keydown)="isValidNumber($event)"></ion-input>
      ...
     </ion-col>
    </ion-row>
   </ion-col>
  </ion-row>
</ion-grid>
</div>

ts

findActivity(idx) {
      console.log('index    : ', idx)
      console.log('barcode2 : ', this.rows.at(idx).value)
      console.log('barcode2 : ', this.rows.at(idx).value.barcode2)
      console.log('barcode2 : ', this.rows.at(idx).get('barcode2').value)
  }

package.json

{
  "name": "app",
  "version": "0.0.1",
  "author": "Ionic Framework",
  "homepage": "https://ionicframework.com/",
  "scripts": {
    "ng": "ng",
    "start": "ng serve",
    "build": "ng build",
    "test": "ng test",
    "lint": "ng lint",
    "e2e": "ng e2e"
  },
  "private": true,
  "dependencies": {
    "@angular/animations": "^9.1.11",
    "@angular/common": "~9.1.11",
    "@angular/core": "~9.1.11",
    "@angular/forms": "~9.1.11",
    "@angular/platform-browser": "~9.1.11",
    "@angular/platform-browser-dynamic": "~9.1.11",
    "@angular/pwa": "^0.803.28",
    "@angular/router": "~9.1.11",
    "@angular/service-worker": "~9.1.11",
    "@ionic-native/core": "^5.27.0",
    "@ionic-native/splash-screen": "^5.27.0",
    "@ionic-native/status-bar": "^5.27.0",
    "@ionic/angular": "^5.2.3",
    "core-js": "^2.5.4",
    "date-fns": "^2.14.0",
    "idb": "^4.0.5",
    "rxjs": "~6.5.5",
    "tslib": "^1.13.0",
    "zone.js": "~0.10.3"
  },
  "devDependencies": {
    "@angular-devkit/architect": "~0.801.2",
    "@angular-devkit/build-angular": "^0.901.10",
    "@angular-devkit/core": "^9.1.10",
    "@angular-devkit/schematics": "^9.1.10",
    "@angular/cli": "^9.1.10",
    "@angular/compiler": "~9.1.11",
    "@angular/compiler-cli": "~9.1.11",
    "@angular/language-service": "~9.1.11",
    "@ionic/angular-toolkit": "^2.2.0",
    "@types/jasmine": "~3.3.8",
    "@types/jasminewd2": "~2.0.3",
    "@types/node": "~8.9.4",
    "codelyzer": "^5.2.2",
    "jasmine-core": "~3.4.0",
    "jasmine-spec-reporter": "~4.2.1",
    "karma": "~4.1.0",
    "karma-chrome-launcher": "~2.2.0",
    "karma-coverage-istanbul-reporter": "~2.0.1",
    "karma-jasmine": "~2.0.1",
    "karma-jasmine-html-reporter": "^1.5.4",
    "protractor": "^5.4.4",
    "ts-node": "~7.0.0",
    "tslint": "~5.15.0",
    "typescript": "~3.8.3"
  },
  "description": "An Ionic project"
}

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